Payment not completed in App Store
Why I can't install apps on my appstore ?
[Edited by Moderator]
iPhone 7 Plus
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This document explains how to 'Change, add, [review,] or remove Apple ID payment methods' on an Apple mobile device, a Mac, or a PC; click here --> https://support.apple.com/HT201266
Review your payment methods. If they are show in red there's a problem and you need to add a different payment method or add one to the one you have there.